. Zoology : for students and general readers . Zoology. FLIGHT OF INSECTS. 349 and anal veins. So that the wings of insects act as lungs as well as organs of flight. For the latter purpose, the principal veins are situated near the front edge of the wing,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879